Improvement in locks



UNITED STATES @PATENT trice.

JOHN TRACY MYGATT, OF BINGHAMTON, NEW YORK.

IMPROVEMENT IN LOCKS.

Specification forming part of Letters Patent No. 37,700, dated February 17, 1863.

To all whom it may concern:

Beit known that I, JOHN T. MYGATT, of Binghamton, in the county of Broome and State of New York, have invented a new and useful Improvement in Locks and Latches; and I do hereby decla-re that the followiugis a i'ull, clear, and exact description of the same, reference bein g had to the accom pan yin g drawings, making a part of this specification, in which- Figure 1 is a horizontal section of a knoblatch having my improvement applied to it, ma', Fig. 2, indicating the plane of section; Fig. 2, a transverse section of the same, taken in j the line x x', Fig. l; Fig. 3, a face View ofan adjustable or turning collar which pertains to the same.

Similar letters of reference indicate corresponding parts in the several figures.

The invention relates to an improvement in locks and latches which are provided with a sliding latch-bolt operated by the turning of a knob.

The invention consists in constructing and arranging the knob and knob-arbor in such a manner that the projections on the hub, which is fitted on the arbor, may be thrown in and out of line with the slide, against which the latch-bolt bears, and the latter, when desired, be rendered entirelyT free from the projections on the hub, so that they cannot act upon the latch-bolt when the knob is turned, and the former thereby be made to answer the purpose of a bolt.

The object of the invention is to render, when necessary or desired, the ordinary lock or knob-latch inoperative from the outer side of a door, and render useless the appliance of bolts or fastenings of any kind at the inner side.

To enable those skilled in the art to fully understand and construct my invention, Iwill proceed to describe it.

A represents the case of an ordinary knoblatch, B is the latch-bolt, O the slide, and D the spring which throws the latch-bolt inward. These parts are constructed in the usual way, and therefore do not require a minute description.

E represents the knob-arbor, which passes transversely through the case A, and has a knob, F, on each end of it. One knob, however, is only shown in the drawings. Ou the knob-arbor E there is iirmly keyed a hub, G, which has two projegtions, a a, extending from it, as usual, oueateach side of the knobarbor E. The inner end ofthe shank b of the knob (the one represented in the drawings, and which is designed to be at the inner' side ofthe door) is made in oblique form, as shown at c in Fig. 1, and on the knob-arbor E, adjoining the oblique end c of the shank b, there is placed loosely a collar, H, having its end which adjoins the oblique end c of the shank b also of oblique form, as shown at din Fig. l. The knob F is firmly attached to the arbor E, and the shank b of said knob is provided with a catch, c, which is formed of a pin having a small spiral spring behind it to keep the pin out-from the end of the shank b. This pin has a pin, f, projecting at right angles from it and extending through an oblong slot, g, in the shank b. (See Fig. l.) In the face or oblique end of the collar H (see Fig. 3) there are made two holes, h h', at opposite sides of the arbor E, one hole, h, being at the most prominent part of the oblique face, and the other, hf, at the most depressed part. These holes are of such diameter that they will receive the pin orl catch e when in line with it. On the inner side of the case A, andconcen tric with the knob-arbor E, there is secured a cap, I, in which a spiral spring, J, is placed, and through which the arbor E passes. The inner end of this spring J bears against the hub G, and the outer end bears against apartition or head, i, in the cap. This spring has a tendency to keep the projections a a on the hub G in line with projections j on the slide C, so that the slide and the bolt B, which is connected with it, may be operated by the turning of the arbor E, and the end of the bolt B be drawn within the case A. v

In order to render the bolt B inoperative, all that is necessary to be done is to move the arbor E longitudinally, in order to throw the projections a a on the hub Gr out of line with the projections 7' on the slide G, as indicated in red iu Fig. l. This is effected by turning the collar H on the arbor E, the oblique ends c d of the shank b and collar H causing such result. In order to turn the collar H, the pin or catch c is thrown out from the hole h in the collar, the latter being turned until said pin passes into the other hole, h. The position of the knob F, when thus adjusted, is shown in red outline in Fig. l. The collar His provided at its inner end with a flange, k, over which a lip or flange, l, on the outer end of the cap I lits and holds the collar to the cap. In order to admit of vthe arbor resuming its former position, so that the projections a a of the hub G Willbeinline With the projections j of the slide, the pin or catch e is drawn out from the hole h in the collar, and the knob F turned until the pin or catch enters the hole h. Thus by this simple contrivance it Will be seen that the arbor E may be prevented at any time from acting upon the latch-bolt when turned from the outer side of the door, and the application of belts and extra fastenings at the inner side of the door rendered entirely unnecessary.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is-

The collar H, placed loosely on the arbor E, and provided with an oblique end, d, in combination With the oblique end c of the shank b of the knob F, pin or catch e, the spring J, and cap I, all arranged With the arbor E, to operate as and for the purpose set forth.

JOHN TRACY MYGATT.

Witnesses:

THOMAS D. WRIGHT, A. D. ARMSTRONG. 

